[Coco] My humble Coco3 sprite project update

[Richard Goedeken]

Looks great.  Bubble Bobble characters and clouds from Super Mario Bros.  I'm
looking forward to the videos.

Richard

On 03/19/2015 07:32 PM, Hugo Dufort wrote:
> Hi! I would like to that the people who have helped me getting on track with
> the Coco3 memory map, GIME and ASM. My humble Coco3 project is showing some
> results, which I can post online. For now it will only be screenshots, but
> eventually I'll post some videos as well. Here is what I have accomplished so
> far:
> - understand and use the hi-res graphics modes of the Coco3, set palettes, map
> memory pages, etc.
> - define and decode raster images using Base64 directly in the ASM code (this
> memory block can be reused once the images are extracted and packed to another
> area in memory)
> - create Buffer structures (fast-rendering bitmaps with no transparency)
> - create Sprite structures (fast-rendering bitmaps with transparency)
> - create TileSet structures (very fast-rendering 8x8 tiles)
> - render buffers, sprites and tiles
> - animate sprites using buffers
> 
> I have implemented, then abandoned my palette mask trick -- it was faster than
> my current sprite technique, but not by much. I currently use an optimization
> technique that interleaves the bitmap and its mask, which allows me to load 2
> pixels and their mask in each loop using a single pointer. With the whole
> rendering loop working in A,B,X,Y (and sometimes U), no need to push/read the
> stack.
> 
> Right now I am working on page flipping and learning some addressing modes of
> the 6809 that are still a mystery to me!
> 
> Here is my first screenshot:
> http://avantrad.ca/upload/hugo/coco3sprites1.png
> 
> 
> Hugo Dufort
> 
> 
> 
> ---
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